Machine for applying a web to a strand



June 4, 1935. c. B. FANTONE Er AL 2,003,354

MACHINE FOR APPLYING A WEB TO A,STRAND Filed Aug. 23, 1934 5Sheets-Sheet 1 mi (TW 5 R Y U E E M W EEG 0 W3 w 1M0 A mm W CfY B Junec. B. FANTONE ET AL 2,003,354

MACHINE FOR APPLYING A WEB TO A STRAND Filed Aug. 23, 1934 5Sheets-Sheet 2 INVENTOR; c/mr/efi B fZmfOne dwar'd G. Parwn BY Q TTNEYS.

June 1935- c, B. FANTONE ET AL 2,003,354

MACHINE FOR APPLYING A WEB TO A STRAND Filed Aug. 23, 1934 5Sheets-Sheet 3 INVENTORF le Edward G. Far-win ZQQRNEYS.

June 4, 1935. c B FANTONE r AL 2,003,354

MACHINE FOR APPLYING A WEB TO A STRAND Filed Aug. 2:5, 1934 5 seetssheet 4 Saving l'kall INV NTO Charles .Fan m Ed ar G. Per BY QTaKC-UP ATTORNEY-5 J1me 1935- c. B. FANTONE ET AL 2,003,354

MACHINE FOR APPLYING A WEB TO A STRAND Filed Aug. 25, 1934 5Sheets-Sheet 5 98 INVENTORE C/mrizs B [T I gi G. Fir-v1}:

ATTORNEY5.

Patented June 4, 1935 PATENT OFFICE MACHINE FOR APPLYING A WEB TO ASTRAND Charles B. Fantone, Ly'ndhurst, and Edward G.

Parvin, Roselle, N. J.,

chine Company, Newark,

of New Jersey Application August 23,

19 Claims.

This invention relates to improvements in machines of the type employedfor wrapping a narrow web or tape of insulating or similar materialabout 'a longitudinally moving strand or cord in the form of a helicalrod composed of abutting or overlapping turns.

One of the objects of the invention is to provide an improved andautomatic form of brake for the cop and cop spindle of such machineswhich acts to immediately bring the cop to a dead stop when the webbreaks.

A further object of the invention is to provide in conjunction with theabove mentioned brake a brake for the serving head upon which the cop ismounted to likewise bring it to a dead stop when the web breaks.

A further object of this invention is to provide an automatic switchwhich operates to closed position when the web breaks to stop themachine and energize both of said brakes.

These and many other objects, as will appear from the followingdisclosure are secured by means of the structure which comprises thisinvention.

This invention resides substantially in "the combination, construction,arrangement and relative location of parts, all as will be fullydescribed below.

In the drawings,

Fig. 1 is a vertical, central, cross sectional view of a serving head towhich the herein disclosed invention is applied, showing some parts inelevation;

Fig. 2 is a top plan view thereof with some parts broken away;

Fig. 3 is a cross sectional view through the commutator;

Fig. 4 is an enlarged vertical, central, cross sectional view throughthe cop spindle showing the automatic cop spindle brake in elevation;

Fig. 5 is a top plan view of the automatic switch and cop spindle brakeshowing the shaft in cross section; I t

Fig. 6 is a cross sectional view taken on the line 66 of Fig.5; 1

Fig. 7 is a cross sectional view taken on the line 1-l of Fig. 5;

Fig. 8 is a diagrammatic view of the circuit connections for a completemachine of which the serving head is a part, and shows the connection ofthe various parts in a system in which both commutator rings of theserving-head are employed;

' Fig. 9 is a diagrammatic view 01' the circuit connections of theportion of the circuit of Fig. 8

assignors to Syncro Ma- N. .L, a corporation 1934', Serial No. 741,046

modified to show an arrangement in which only one commutator ring isemployed;

Fig. 10 is a further modification employing but a single commutatorring.

The present invention represents an improvement of a portion of themachine shown in the copending application of Fantone and Jameson,Serial No. 702,520, filed December 15, 1933. The structure hereindisclosed is concerned particularly with improvements in the servinghead of a machine such as that disclosed in the above mentionedcopending application. The general electric circuit arrangements asemployed with the apparatus of which the structure of this case is animprovement is similar to that disclosed in the above mentionedcopending application and is shown in this case'with the modificationswhich adapt it for use with the improved serving head structure about tobe described.

The standard or bracket l which supports the serving head is to beattached to the main standard of the machine in proper position and hassecured thereto in any suitable way the serving head motor 2. This motoris provided with a shaft 3 which has a central passage extendingentirely therethrough through which the strand or wire W passeslongitudinally. Secured to the shaft 3 at the upper end of the motor isthe bearing member 4 which is journaled in the casing 5 forming a partof the upper end plate andv the motor, as illustrated. The casing 5extends into a radial platform or vertically extending wall at itsperiphery. The rotatable base plate I in the general form of a disc isprovided with a central depending hub 8. This base plate is secured tothe bearing member 4, which rotating with the shaft 3, causes conjointrotation of the base plate. The depending hub 8 is provided with aninsulating ring 9 on its periphery upon which in turn are mounted thecontinuous commutator rings l and II. Ring II is engaged by a brush l3which is slidably mounted in a brush holder tube 12. Mounted upon theplate 6 in suitable supports, as shown, so as to insulate it therefromwithin the tube, is a spring l4 bearing upon the brush l3 to urge itinto contact with the commutator ring II, and held in place by means ofa removable insulating screw cap l5. In a similar way a brush it for thecommutator ring 10 is mounted at the opposite side of the machine.

Supported upon the base plate I with an angular displacement of 90degrees are the four rotatable guides l1 which are commonly used withserving heads of this type. The base platel isprovided with a centralcavity l8 opening from the top thereof and preferably of circular crosssection. Within this cavity, and mounted upon" shaft 3, is a cylindricalcup shaped iron or steel casing 89. This casing is keyed to the shaft 3for rotation therewith, but is slidably mounted thereon. Springs l9 areinterposed between the bottom of the cavity and the bottom of the casingl9 so as to form a resilient seat therefor. Within the casing I9 is anannular member 20 having a central upstanding circular ridge 2.5 with arounded top edge, as is clear from Fig. 6. The ring-like member 20 isrotatably journaled in the casing l9 on the ball bearing 21. Fittingsnugly within the inner wall of the casing l9 is a ring shapedmagnetizable winding 22.

The ring like member 20 is connected to the casing 69 by means of a coilspring 23 having its lower end in a slot in the casing (see Fig. 6) andhaving its upper end in a slot in the ring-like member 20. Thus themember 20 is locked to the casing l9 and the shaft 3 but is permittedsome relative movement with respect thereto through this springconnection.

Mounted between the winding 22 and the member 20 is a bracket 26 havingan adjustable stop screw 25 locked thereon. This stop screwis'positioned to engage an arm 23 secured to the member 20 and having adepending lip for engagement with the stop screw. Upon the other side ofthe ring 23 is secured another arm 28 having a contact secured thereto.This contact is positioned so as to engage a fixed contact 29 mounted ina bracket 3!] and insulated therefrom, which bracket is secured to thecasing I9. The spring 23 is so arranged that normally it causes themember 20 to rotate on its bearing so as to engage the contact on thearm 20 with contact 29. Secured diametrically opposite to each other inthe casing I 9, are a pair of brackets 3! which have lips overlying thering member 20 so as to hold it from moving longitudinally on the shaft3.

As has been clearly shown in Fig.4 there is mounted uponthe shaft 3towards its upper end, by means of roller bearings 34 and 35, the copspindle 32. Such spindles are commonly used in serving heads of thistype, and are constructed to receive the cord or spool of tape to bewrapped around the string or wire. Secured to the lower end of the copspindle is an iron or steel disc 33 positioned not only to engage therounded edge of the ridge 2!, but when in such engagement to be in closeproximity to the rim of the cup shaped member IS. The upper end of thecop spindle is engaged by a ball bearing 31 which is applied un-' derthe proper pressure to the end thereof by means of a verticallyadjustable hand nut 36. Thus the pressure of the cop spindle and casing19 with all of its parts upon the springs l9 may be properly adjusted tospace the web from the cop under proper tension as it is fed therefrom.The upper end of shaft 3 is longitudinally slotted and tapered and isthreadedly engaged by an adjustable nut 40 which is internally tapered.By means of this locking arrangement the guide die 38 may be locked inplace. This die has a smaller bore through the center thereof forguiding the wire or string therethrough. Secured to g the guide die 39is the nose piece 4| upon which in turn is mounted the nose guide 42.Both of these parts are likewise commonly used with devices of thistype.

The rotatable base plate I is provided with a peripheral rabbet forminga depending flange l of cylindrical cross section which is engaged bythe brake bands 43 and M, which are pivotally tically movable rod 49.This rod is provided with a cam member 52 which lies between the endside faces of the extensions and the brake bands. The lower end of rod69 is pivotally connected to the armature 545. This armature ispivotally supported upon a steel bracket 55 which forms a part of thecore for the electro-magnet 58. As will be apparent, when theelectro-magnet is energized the armature will be pulled down carryingwith it rod 49 and cam 52. The cam will be forced between the projectingends of the brake bands forcing them apart and releasing the brake.Whenever the electro-magnetis deenergized spring 55 will draw thearmature, rod and cam upwardly and permit the springs 48 to apply thebrakes to the rotatable base plate 1.

A complete circuit arrangement for the apparatus will now be describedin detail. The complete machine as illustrated in the above mentionedapplication, modified to the extent of employing the serving head ofthis application is illustrated in Figs. 1 to 7 inclusive. The featureof the circuit diagram about to be described,'

and illustrated in Fig. 8 is that two commutator rings are employedonthe serving head as illustrated in Fig. 1 with circuit connections suchthat the brake coil is energized every time the machine is shut downeither by the automatic stop switch, or by a manual stop button. Themain power supply is illustrated as a three phase alternating currentcircuit represented by the supply mains 60. At BI is the main controlswitch by means of which the entire apparatus may be disconnected fromthe power source. The wires also extend through a second control switch62 which is operated to energize and deenergize the take-up motor 63. Asillustrated in the above mentioned application, the take-up mtor isemployed to operate the take-up reel upon which the finished product iswound. When switches BI and 62 are closed the motor 63 is directlyenergized for operation at a speed determined by the adjustment of therheostats I09 connected to the rotor circuit of that motor by the wiresI08. Wires 60 are connected by wires 64 to the stator or field windingof the motor 65 which is directly connected to an alternating current.generator and to the capstan wheel, in accordance with the disclosure inthe above mentioned application. 66 diagrammatically represents thegenerator operated by the motor 65.

The rotor of the motor 65 is connected by the wires 61 to theresistances 68, which in turn are connected by the wires 69 and II toone contact of each of the two upper pairs of the relay 10. Thecorresponding contacts are connected together and by wire 12 to thethree resistances 68. These resistances are connected in a potentiometercircuit, and are provided with the variable tap connections 13, 14 and15, each of which is connected to one of the resistances 18. These wiresare respectively connected by the wires 19, 8| and 82 to the contacts ofthe relay 80, as illustrated. The other ends of resistances 18 'areconnected by the wires 83, 85 and 86 to the contacts of relay 84 asillustrated. At 81 and 88 I are electric time clocks which operate theswitches 93 and 92, respectively. These time clocks are of any one of anumber of well known forms, and are of the type which may be set tooperate for a predetermined period of time at the end of which theswitches which are a part thereof close.

One terminal of the operating solenoid of relay 18 is connected by wire16 to one terminal of the solenoid of relay 88, one terminal of thesolenoid. of relay 84, one terminal of the time clock 81, one terminalof the time clock 88, and to wire 11, which is connected to one terminalof the brake solenoid 56, and to one terminal of the secondary I82 ofthe transformer I88.

The other terminal of the solenoid of relay 18 is connected by wire 89to one contact of the start switch 98 and to wire 9| which interconnectsthe other terminal of the brake solenoid 56 with one terminal of each ofthe switches 92 and 93 of the time clocks. Wire 9I is also connected tothe other terminal of the time clock 88. The other terminal of thesolenoid of relay 88 is connected by wire 94 to the other contact ofswitch 93, and the other terminal of the solenoid of relay 84 isconnected by wire 95 to the other contact of switch 92, and to the otherterminal of the time clock 81. One terminal of the normally closed stopswitch 98 is connected by wire 99 to one contact of the second highestpair of relay 18. The corresponding contact is connected by wire 59 towire 89. The remaining contacts of switches 98 and 98 are connected by acommon wire 96 to onecontact of the relay 91. The other contact of thisrelay is connectedto the other terminal of. secondary I82. Anothersecondary I83 of the transformer I8I has one terminal grounded and isconnected at its other terminal by wire I84'to the solenoid of relay 91,which in turn has its other terminal connected by wire I85 to the brushof ring II. The primary of the transformer IN is connected through wireI88 to one phase of the main current supply. The brush of ring I8 isconnected by wire I86 to one of the contacts of the lowest pair ofrelays 18.

The corresponding contact is connected by wire I81 to wire I84. It isnoted that relays 18, 88, 84 and 91 are shown in deenergized position.

The stator or field winding III of the generator 66 is connected by thewires .I I8 to the main current source. This winding is of course athree-phase Winding. One of the terminals is connected by Wire II 3directly to one terminal of the three-phase field winding N4 of theserving head motor 2. The other terminals of the field winding III areconnected by the wires] I2 to the reversing switch H5, and through it bywires- H6 to the remaining terminals of the field II4. In a similarmanner? the rotor windings of the generator are connected by wire I I1to one terminal of the three-phase rotor winding of the serving headmotor 2, and by wires II 8 through the reversing switch and-wires II9 tothe other terminals of the serving head rotor.

The operation of this circuit'will now be described. The reversingswitch H5 is at either of its two positions, depending upon the desireddirection of rotation of the serving head. The value of this feature isthat where two or more i layers of insulation are applied to a wire in aThe parts in Fig. 8 are all shown in completely deenergized position,switch 6I being open. The stop switch 28 is of course normally open whenthere is tension on the tapeor web which is to be wound around the wire,as will be apparent from the above description of the automatic stopswitch.

When the switch BI is closed the fields of the motor 65 and thegenerator 66 are energized and the primary of transformer I8I isenergized. To start the machine up switch 62 is closed, therebyenergizing the take-up motor 63. Start switch 98 is'closed, with theresult that current flows from secondary I82 through relay 91, wire 96,switch 98, wire 89, the solenoid of relay 18, wire 16, the operatingwinding of time clock 88, and by wire 11 back to the other terminal ofthe secondary I82. Current also flows from wire 16 to the brake solenoid56 by way of wire 9I and wire 11 to the secondary I82. The time clock 88has been set to close the switch 92 at the end of a predetermined periodof time for a purpose to be described. The switches controlled by therelay 18 will be closed and the brake dle brake coil 22 will be brokenat the lowest 6 pair of contacts of relay 18. Thus only a momentar yclosure of switch 98 is necessary.

Until switch 92 closes the resistance in the rotor circuit of motor 65is-the resistance 68 which is the maximum amount. Motor 65 will thenbegin to operate and will pick up to a speed corresponding to thatamount of resistance in its rotor circuit when time switch 92 is closedby the time clock' 88 at the end of the period for which it is set thecircuit to the solenoid of relay 84 is closed and the operating windingof time switch 81 is energized, starting it. Energization of relay 84closes its switches putting a short circuit on the right hand end ofresistors T8. The resistance in the rotor circuit of motor 65 is that ofresistors 18 plus the resistance of the portions of resistors 88 to theright of adjustable taps 13, 14 and 15. The resistance of resistors 18is less than that of resistors 68. The motor therefor continues to pickup speed until the end. of a predetermined period, when the time clock81 closes the switch 93. Relay 88 is thus energized, having a shortcircuit across the left hand ends of resistances 18. The result is thatthe resistance in the rotor circuit is that of the portions of resistors68 to the right of taps 13, 14 and 15 which is a less amount than thatrepresented by the previous set of connections. The motor thus comes upto final and operating operate, its winding being energized from thegenerator in an obvious manner. The apparatus then continues to operateuntil the stop switch 98 is opened. When this occurs the holding circuitfor the relay 18 through wire 99 is broken, thus opening the rotorcircuit of the motor 65.

At the same time a circuit for the cop spindle brake coil 22 is madefrom the secondary I83 through wire I81, the lowest pair of contacts ofrelay 18, wire I86, commutator ring I18, and

thence through the brake winding 22 to ground. This immediately bringsthe cop spindle to a stop-, preventing it from overrunning, and thuspreventing an undesirable unwinding of the tape on the cop spindle. Atthe same time that the holding circuit for the.relay I is broken thecircuit for the brake solenoid B is broken, so that the brake bands 43and M (Fig. 2) may bring the serving head to a quick stop.

These same operations will occur automatically if the web T breaks. Whenthis web breaks switch 28 will close in accordance with the structurethereof as described in connection with Figs. 5, 6 and 7, so that acircuit to the operating solenoid of relay 9! is made through wire I95,wire IM and the secondary I03. When this happens the relay opens again,breaking the holding circuit for relay l9, and breaking the circuit forthe brake-solenoid 56. Thus the arrangement just described efiectsautomatic stopping of the apparatus and prevents overrunning of the copspindle Whether the machine is brought to a stop in the normal way byopening the stop switch 98-, or whether it is brought to a stop in anemergency operation when the tape breaks or the .tension thereof isreduced at any time sufiiciently to permit the switch 29 to close.

A modificsation of this circuit in part is illustrated in'Fig. 9 to showthe connections necessary when only one commutator ring is employed onthe serving head. With this arrangement the brake coil for the copspindle will only'be energized when the machine is stopped by theautomatic switch, and will not be energized when the stop switch isopened. Only that portion of the main circuit of Fig. 8 is hereinillustrated to bring out the change in connections involved,

, part of the entire system.

although of course the circuit of Fig. 9 is only a In some cases thevsame reference numerals have been used to ply is shown at I50 asbefore, and the main switch I is shown at 6|. The wires 60 each go' toone contact of the three upper pairs of the relay ill. The correspondingcontacts are connected by the wires I32 tothe field of the motor 65. Therotor circuit in this case is illustrated with adjustable resistances 68therein, it being apparent, .however, that the potentiometer arrangementof interconnected relays and time clock switches may be employed toeffect automatic starting of this motor. The arrangement'of Fig. 9 is amanual equivalent thereof in which the amount of resistance is graduallycut into the rotor circuit manually. The primary of the transformer I36is energized from one phase of the main circuit by the wires I35. Oneterminal of the solenoid of relay I0 is connected by wire I34 to one ofthe wires 60 and the other terminal is connected by wire I33 to wireI31, which interconnects one contact of the start switch 98 with one ofthe contacts of the lowest pair of the relay 19.

One contact of the stop switch 98 is connected by wire I38 to one of thecontacts of the normally closed relay-91. The other contact is connectedby wire I39 tothe other contact of the lowest pair of relays IS. Theother two contacts of the switches 98 and 98 are connected by acommonwire to, one of the wires I35. One terminal of the solenoid of relay 9'!is connected to ground through the secondary of transformer I36 and theother terminal is connected by wire M9 to the brush of the commutatorring I0. With this arrangement. when switch BI is closed the primary oftransformer I36 is energized. To energize relay 70 start switch 90 isclosed, current flows from the current source through switch 90, wireI37, wire I33, the solenoid of relay Hi and wire I3 3 'back to thecurrent source. A holding circuit for the relay is then made throughstop switch 98, the switch of relay 9?, wire I39, the lowest pair ofcontacts of relay I0 and wires I31 and I33.

To stop the machine in normal operation it is only necessary to openswitch 98, thereby opening the holding circuit and deenergizing relay'Il]. However, the cop spindle brake coil 22 is not energized. If whenthe machine is running the tape or web being fed from the cop breaks,switch 28 closes completing a circuit that is quite apparent throughwire MB to energize relay 9? so that it breaks the holding circuit forrelay I0. At the same time the brake coil 22 is energized, therebybringing the cop spindle to .a quick stop.

In the modification of Fig. but one commutator ring is again used inwhich arrangement the cop spindle brake coil 22 will be energized whenthe machine is stopped by the stop button 98, or by the closing of theautomatic stop switch 28. In this arrangement the main circuit wires 60are again connected through a control switch GI to the field of themotor 65. The primary of the transformer I36 is connected by wires I35to the current source. The resistances 6B are connected in the rotorcircuit of the motor. Here again, as before the automatic potentiometerstarting circuit illustrated in Fig. 8 may be employed' In this case therelay HI has its operating winding connected at one terminal by wire I45to one of the wires I35. The other terminal of this winding is connectedby wire I46 to one of the contacts of the start switch 99 and islikewise connected to one contact of the third lowest pair of the relay.One contact of the stop switch 98 is connected by wire I48 through therelay switch 91 and wire I49 to the other contact of the third lowestpair of relay ID. The other contacts of the switches 90 and 98 areconnected to a common wire I41 to the other wire I35. One terminal ofthe grounded secondary of transformer I36 is connected to one terminalof the solenoid of relay 9? and to one contact of the lowest pair ofrelay Ti). The other contact of this pair is connected to wire I50 whichconnects the other terminal of the solenoid of relay 91 with the brushof ring I 0. One terminal of the upper and lower resistances B8 isconnected by the wires Ital to one contact of each of the two upperpairs of relay 19. The corresponding contacts of these" pairs areconnected by a common wire I52 to the remaining resistance 58.

In this arrangement the relative strength of the windings 22 and 97 issuch that when switch 28 is opened the current flowing is not enough Ito operate the relay or enough to; cause the brake coil 22 to exert anyserious braking action on the cop spindle. When switch BI is closed theprimary of transformer I36 is energized and the stator or field windingof motor is energized.

To start .the apparatus switch 93 is closedwhich completes a circuitwhich may readily be followed to the solenoid of relay 79, energizing itand operating the relay. The operation of the relay escircuit. At thesame time a more direct circuit from the secondary of transformer I36through the lowest pair of contacts of relay 10 is made to the brakecoil 22 causing it to prevent thecop spindle from overrunning anddirectly short circuiting the winding of relay 91. When the apparatus isautomatically'stopped by the breaking of the tape, switch 28 closes,completing the circuit tothe solenoid of relay 9] through wire I50 andhence breaking the holding circuit for relay 10 at relay 91. Here againthe return of relay 10 to the deenergized position shown short circuitsrelay 9'! and directly connects the cop spindle brake coil 22 to thesecondary of transformer I36.

From the above description it will be apparent that this inventionresides in certain principles of construction which may be embodied inother physical forms without departure from the scope thereof. We donot, therefore desire to be strictly limited to the disclosure as givenfor purposes of illustration, but rather to the scope of the appendedclaims.

What we seek to secure by United States Letters Patent is:

l. A serving head as described comprising a -motor, a rotatable supportdriven by said motor,

a cop spindle rotatably journaled on said support, a magnetic brakeacting upon the cop spindle to prevent rotation thereof on the supportwhen energized, an energizing circuit for said brake including a controlswitch, means for biasing said switch to closed position, and meansacting to oppose said biasing means to prevent closing of said switchwhen a web is being fed from a cop on the cop spindle.

2. A serving head structure of the type described comprising a motor, arotatable member driven by said motor, a cop spindle journaled on saidmember for supporting a strand spool, and magnetic braking means securedto said member and rotated by it including a switchfor controlling acircuit to energize said means when the strand breaks to preventrotation of the cop spindle on said member.

3. A combination comprising a serving head including a cop spindlerotatably mounted thereon, an electric motor for driving the servinghead, a magnetic brake positioned to act on the cop spindle, a switchhaving an operating member engaging thecop spindle and normally heldopen when a web is being fed from the cop spindle, a circuit for saidmotor and magnetic brake including a control device controlled by saidswitch whereby said motor is deenergized and the magnetic brake isenergized when the web breaks.

4. An apparatus as described comprising a serving head having a copspindle rotatably mounted thereon, said cop spindle being adapted tosupport a'strand spool, means for rotating the serving head, a magnetwinding positioned to bring the cop spindleto a stop when energized anda switch engaging the cop spindle and held open by rotation thereof forcompleting a circuit to the winding when a strand fed from the spoolbreaks.

5.-An apparatus as described comprising a serving head having a copspindle rotatably mounted thereon, said cop spindle being adapted tosupport a strand spool, means for rotating the serving head, a magnetwinding positioned to bring the cop spindle to a stop when energized,

held open when a strand is being fed from the strand spool.

6. In a structure as described the combination magnet winding mountedadjacent the cop spindle for bringing the cop spindle to a stop whenenergized, a circuit for said winding, and a normally closed switch insaid circuit and positioned to engage the cop spindle so as to be heldopen by the feeding of a strand from the cop spindle.

8. In a structure as described the combination comprising a rotatableplate, a magnetizable cop spindle rotatably journaled on the plate, afixed magnet winding mounted adjacent the cop spindle for bringing thecop spindle to a stop when energized, a spring closed switch positionedto engage the cop spindle and normally held open against the closingaction of the spring by the feeding of a strand from the cop spindle,and a circuit including said winding and switch whereby the winding isenergized when the strand breaks.

9. In a serving head of the typefor wrapping a web around a core andincluding a rotatable shaft having a cop spindle freely journaledthereon for supporting a web spool, the combination comprising amagnetizable core positioned adjacent the cop spindle, a magnetizingwinding therefor, a switch positioned engaged by the cop spindle andnormally held open by the feed of a web from the spool on the spindle,and circuits including said switch and winding whereby the winding isenergized when the web breaks.

10. A stopping mechanism for a serving head comprising in combination amotor driven serving head having a cop spindle rotatably mountedthereon, an energizing circuit for said motor, a switch in said circuitengaged by the cop spindle and normally held open when a webis being fedtherefrom, and means for closing the switch when the web breaks. 1

11. A stopping mechanism for a serving head comprising in combination. amotor driven serving head having a cop spindle rotatably mountedthereon, a switch engaged by the cop spindle and normally held open whena web is being fed therefrom, means for closing the switch, a magneticbrake operating on the cop spindle and circuits for said motor and brakecontrolled by said switch for causing deenergization of the motor andenergization of thebrake when the switch closes.

12. In a machine for applying a web in the form of a spiral wrap around"a longitudinally moving strand, the combination comprising a motordriven serving head, a motor generaton'connected to the serving head tooperate it, energizing circuits for the serving head motor and the motorgenerator including starting resistances for the motor and the motorgenerator, andautomatically operating time switches for graduallycutting resistances in to the rotor circuit of said motor.

13. In a machine of the type flescribed the combination comprising aserving head, an electric motor for operating the serving head, agenerator connected thereto for supplying current to the serving headmotor, a second motor for operating the generator, energizing circuitsfor said second motor including control devices, and

means for automatically cutting resistances in to the circuits of thesecond motor to bring it up to speed after initial energization.

14. In a machine for wrapping a web around a core, the combinationcomprising a serving head, an electric motor for operating the servinghead, a generator connected to said motor for energizing it, a secondmotor for operating the generator, energizing circuits for the secondmotor and said generator, including control devices, and

means connected to' the control devices for operating them to break theenergizing circuits when the web breaks.

15. In a machine for wrapping a web around a core, the combinationcomprising a serving head, an electric motor for operating the servinghead, a generator connected to said motor for energizing it, a secondmotor for operating the generator, energizing circuits for the secondmotor and said generator including control devices, means connected tothe control devices for operating them to break the energizing circuitswhen the web breaks, and a magnetic brake controlled by, said controldevices for bringing the serving head to a stop When the web breaks.

16. In a machine for wrapping a webaround a core, a serving head havinga freely rotatable web spool spindle mounted thereon, an electric motorfor operating the serving head, a generator connected to said motor forenergizing it, a second motor for operating the generator, energizingcircuits for said second motor and generator including control devices,and means connected to the control devices for operating them todeenergize said second motor and said generator when the web breaks.

1?. In a machine for wrapping a web around a core, a serving head havinga freely rotatable web spool spindle mounted thereon, an electric motorfor operating the serving head, a generator connected to said motor forenergizing it, a second motor for operating the generator, energizingcircuits for said second motor and generator including control devices,means connected to the control devices for operating them to deenergizesaid second motor and said generator when the web breaks, and magneticbraking means energized when the web breaks for preventing rotation ofthe spool spindle on the serving head. L

18. A structure as described comprising a rotatable plate, a cop spindlerotatably mounted on said plate, a magnetizable member secured to saidcop spindle, a magnetic brake positioned to magnetize said member, andmeans controlled by the cop spindle for energizing said brake when theweb being fed from the cop spindle breaks.

19. In a serving head having a power driven shaft, a cop spindle freelyjournaled thereon and a magnetizable member carried by the spindle,v

